Dry Tortugas National Park is one of the most remote national parks in the United States, located about 70 miles west of Key West in the Gulf of Mexico. The park is known for its crystal-clear waters, vibrant coral reefs, abundant marine life, and the massive historic Fort Jefferson. Accessible only by boat or seaplane, Dry Tortugas offers visitors incredible snorkeling, birdwatching, history, and some of the most pristine tropical scenery in the country.